These charts are taken from the 3rd Edition of Monzani's Instructions for the German Flute. "Published as the Act directs, July 20, 1813: by T. Monzani & H. Hill, No.24, Dover Street, London."
According to Monzani: "A Six Keyed Flute, with the additional 7.th 8.th and 9.th Keys [the 9th key being the extra Bb], will be found the most perfect, particularly for the Shakes in the minor modes." Note that Monzani's charts imply that flats are sharper than sharps; e.g. Gb is higher in pitch that F#. This is the same relation as in 18th century fingering charts.
